Npgsql 4.0 Parameters and Null Values

Question

Passing a null value using Npgsql looks something like this:

using (NpgsqlCommand cmd = new NpgsqlCommand(\"insert into foo values (:TEST)\", conn))
{
    cm         


        

Answer 1

I faced with this problem, and now I don't get exceptions with it

Here how I declare parameters for Postgres functions:

string test;
using (NpgsqlCommand cmd = new NpgsqlCommand("insert into foo values (:TEST)", conn))
{
    cmd.Parameters.AddWithValue("TEST", NpgsqlTypes.NpgsqlDbType.Varchar, (object)test?? DBNull.Value);
    cmd.ExecuteNonQuery();
}